//js中 函数 function是一等公民

/*
type Fn = (qwerty)=>void

let fn:Fn = function (){
    return "aaaa"
}

let fn2: Function = (a:string)=>{
    return a
}*/


/*type Fn = (number, number) => void;
let fn:Fn = function (a: number, b: number){

}*/


